On Thu, 2009-11-12 at 20:25 -0500, Sam Varshavchik wrote:
> Linuxguy123 writes:
>
> >
> > In system-config-firewall.py, I did the following:
> >
> > - trusted the wired Ethernet port.
> > - trusted DNS and Multicast DNS
> > - turned on masquerading for the wired ethernet port
> > - applied all these
> >
> > In spite of all this my device is not getting an IP address. What am I
> > missing ?
>
> I say you're missing the correct configuration for your wired segment, and
> you're missing a DHCP server.
>
> > I guess what I am asking is, how do I tell the laptop to serve addresses
> > to clients on the wired Ethernet port ?
>
> For starters, you need to assign a static IP address for your wired
> interface. Your narrative did not include the low-level configuration
> details of both your wired and your wireless interfaces. I'm guessing that
> you probably configured both your wired and your wireless interfaces to use
> automatic settings. That works for wireless, since your wireless address
> point is handing your laptop an IP address. That won't work for your wired
> segment, since there's nothing on your wired segment to give your laptop an
> IP address for its wired network interface, all you have is some dumb device
> there. Your laptop needs to take charge of the wired segment, and run the
> whole show.
>
> Presuming that your access point is assigning your laptop an IP address in
> the 192.168.0.0/24 range, the logical netblock for your wired segment would
> be 192.168.1.0/24, so you'll need to configure your laptop's wired interface
> to a static netblock of 192.168.1.0, and a static IP address of 192.168.1.1.
>
> You do that in Network Configuration. Bring up "Network Configuration", and
> edit your wired interface address.
>
> Turn off all options, including "Controlled by NetworkManager". Turn on
> "Activate device when computer starts", select "Statically set IP
> addresses", put in an address of 192.168.1.1, subnet mask 255.255.255.0, and
> leave the gateway address blank, together with all the DNS fields.
>
> If, on the other hand, your wireless access point is giving your wireless
> interface an 192.168.1.x netblock IP address, you'll just need to turn
> around and set up your wired interface to use the 192.168.0.0/24 range
> instead. Your wired and your wireless interfaces must be on different
> netblock segments, and your laptop bridges the two. That's how it works.
>
> Then:
>
> yum install dhcp
>
> chkconfig on dhcp (so that dhcp starts when you boot your laptop).
>
> man dhcpd.conf
>
> (a lot of reading goes here)
>
> emacs /etc/dhcp/dhcpd.conf
>
> You probably need to do add something like this in your dhcpd.conf file
> (presuming that you're using 192.168.1.0/24 for your wired segment):
>
> subnet 192.168.1.0 netmask 255.255.255.0 {
>
> option subnet-mask 255.255.255.0;
>
> allow unknown-clients;
>
> option routers 192.168.1.1;
> option domain-name-servers 192.168.1.1;
>
> range 192.168.1.129 192.168.1.159;
>
> default-lease-time 604800;
> max-lease-time 604800;
> }
>
> Since, as you say, you're using dnsmasq, you'll need to tell your DHCP
> client (your wired device), that your wired interface's IP address is going
> to be its DNS server (option domain-name-servers), also that your wired
> device needs to use your wired interface as its router (option routers).
>
> Oh, and you'll probably need to reboot, too.
But, but, but... I thought Network Manager had these spiffy options that
allowed one to do this all automatically with the correct selection of
values in a few drop downs ?
Its too much work to set up the DHCP part of this. I'm going to give my
port a static IP via NetworkManager and set the IP on my device to be
static as well then. It doesn't pay to go through all this for just one
device connection.
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